DKIM, no selector required.
Paste a domain. We auto-scan the 16 most common ESP selectors in parallel (Google Workspace, Microsoft 365, Mailchimp, SendGrid, Mailgun, Postmark, Klaviyo, HubSpot, Zendesk, Salesforce). For each one we find, we decode the public key and tell you which keys are strong, weak, or in test mode. If you know your selector, paste it in for a direct lookup.
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DKIM, checked once.
Monitoring tracks every signing selector across your real mail and flags a key before it drifts or expires. Free for one domain.